age ~65
from Pensacola, FL
…He invented the first practical automatic cut-off valve for steam engines, which was patented in 1833. Allen's invention was later proclaimed "one of the greatest inventions ever made in the steam engines" by Stephen Roper in his 1884 Engineer's Handybook.[9]…
Author
Stephen Roper
ISBN #
3923352336
Author
Stephen D. Roper
ISBN #
0874700515